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Unit 1.2
Science
Term | Definition |
---|---|
atom | the smallest unit of element that maintains the properties of that element |
element | a substance that cannot be separated or broken down into simpler substances by chemical means |
compound | a substance made up of atoms of two or more different elements joined by chemical bonds. |
mixture | a combination of two or more substances that are not chemically combined. |
pure substance | a sample of matter, either a single element or a single compound, that has definite chemical and physical properties. |
heterogeneous | describes something that does have a uniform structure or composition throughout. |
homogeneous | describes something that has a uniform structure or composition throughout. |
solid | the state of matter in which the volume and shape of a substance are fixed |
liquid | the state of matter that has a definite volume but not a definite shape |
gas | a form of matter that does not have a definite volume or shape |
freezing | the change of state from a liquid to a solid |
melting | the change of state from a solid to a liquid |
evaporation | the change of state from a liquid to a gas that usually occurs at the surface of a liquid over a wide range of temperatures |
boiling | the change of state from a liquid to a gas that occurs at a specific temperature |
condensation | the change of state from a gas to a liquid |
sublimation | the change of state from a solid directly to a gas |
deposition | the change of state from a gas directly into a solid |